My cycles settings have disapeared
As @Mr Zak suggests in the comments, the Cycles Settings panel does not show in the object properties menu if the active object is a Camera, Empty Object, Lattice or Forcefield; regardless of how many objects you have selected.

Although it is not 100% clear from your screenshot which object is the active object, it appears that you have several Empty's in your scene which may be the culprit, if not the camera.